James a



(No Model.)

' J. A. MALO'NEY.

- SYRINGB.

No. 565,480. Patented Aug. 11, 1 896.

a m/MW. I

%m/mm. /WJ'/MW7 'WMWM I UNITED STATES PATENT OFFICE.

JAMES A. MALONEY, OF W'ASI-IINGTON, DISTRICT OF COLUMBIA, ASSIGNOR TOBENJAMIN S. MINOR, OF SAME PLACE.

SYRINGE.

SPECIFICATION forming part of Letters Patent No. 565,480, dated August11, 1896.

Application filed April 13, 1896. Serial No. 587,341. (No model.)

To all whom it may concern.-

Be it known that I, J AMES A. MALONEY, a citizen of the United States,and a resident of Washington, in the District of Columbia, have inventedcertain new and useful Im provements in Syringes and I do declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains tomake and use the same, reference being had to the accompanying drawings,and to letters of reference marked thereon, which form a part of thisspecification.

Figure 1 of the drawings is a vertical longitudinal section of theinvention. Fig. 2 is a detail view of the cap. or plug, and Fig. 3 is adetail view of the piston.

This invention is designed to provide a syringe wherein the use ofvalves, pistonrods, and packings of all kinds is entirely done awaywith, which is extremely simple in construction and effective inoperation, and can be manufactured at a low cost, and which, owing tothe absence therefrom of all parts which in ordinary syringes are themost subject to wear and impairment, is durable and not likely to getout of order.

With these objects in view the invention consists in the novelconstruction and combination of parts, all as hereinafter described, andpointed out in the appended claim.

Referring to the accompanying drawings, the letter A designates thesyringe tube or cylinder, which is of the usual character, and has atone end the usual tapered and contracted nozzle a. The other end of thecylinder has a cap or plug B, through which is formed a small orifice b.In the drawings I have indicated a plug, preferably of soft rubher,which is inserted in the end of the tube or cylinder, but I desire tostate that an orificed cap or plug of any suitable character may beemployed.

O designates an ordinary rubber bulb,which is secured on the capped orplugged end of the tube or cylinder in the usual manner, that is to say,by means of a grooved annulus, boss, or bead c, with which the lips ofits neck engage.

D designates the piston, which consists of a Short cylinder of hardrubber, glass, or other suitable material capable of taking a smooth orpolished surface such as will cause it to have very little friction uponthe inner surface of the glass, hard rubber, or other material of whichthe tube or cylinder A is composed. This cylinder is preferably of theform shown, that is to say, hollow, with its open end toward the cap orplug B and its closed end toward the nozzle or discharge. A solidcylinder-pistonmay, however, be employed, but less efficiently. Thediameter of the piston is such that it will fit snugly in the tube orcylinder, so as to move freelyand yet form a reasonably-close joint withthe wall thereof.

The operation will be readily understood. When the bulb is compressed,the piston is forced against the liquid charge, which it 1 ejects with aforce proportionate to the degree of pressure exerted on the bulb. Whenthe bulb is released, the piston is drawn back to the cap or plug B bythe suction as the bulb fills. At the same time, if desired, a newcharge is drawn into the syringe.

i In order that the piston may have a stroke equal to the length of thetube or cylinder A,

exclusive of the nozzle portion, the capacity of the bulb should beabout equal to or a little greater than that of the tube, so that whenthe said bulb is compressed nearly or quite to its full limit and theair therein is expelled into the tube A the volume of this air will besufficient to force the piston to the full limit of its throw. Likewisethe return of the air into the bulb as the latter expands will returnthe piston to its opposite limit.

If a soft-rubber plug B is employed, it will form a cushion for thepiston upon its return, should the action of the bulb be somewhatstronger than above indicated.

An advantage arising from the use of this piston over the old form ofsyringes, wherein a bulb is used upon the end of the tube without anypiston, is that the action is much more positive, that is to say, thefull force of the air exhausted from the bulb upon its compression isutilized, instead of being partially dissipated through the liquid, sothat a much stronger discharge is obtained from the nozzle.

Another important advantage is that the piston forms a guard whichprevents any of the contents of the syringe from entering the bulb. Thisis especially important where a syringe is used With medicated liquidscontaining oil or other substances having a softening or deleteriouseffect upon the rubber of the bulb.

The syringe is extremely sensitive in its action, and by propermanipulation of the bulb the force of the discharge can be accuratelycontrolled by the operator. It can also be used advantageously fordropping.

Having thus described my invention, What I claim as new, and desire tosecure by Letters Patent, is-

A syringe comprising a tube or cylinder 15 having a nozzle at one end,and an orificed plug or cap at its opposite end, a bulb secured on thecapped or plugged end, and a loose piston, consisting of a hollowcylinder closed at the end nearest the nozzle, and open at its 20opposite end substantially as specified.

In testimony whereof I affix my signature in presence of two Witnesses.

JAMES A. MALONEY.

\Vitnesses:

GEORGE II. PARMELEE, G. M. ANDERSON.

